When you take a shit, and then you spray like crazy after the main load is finished.

Also, when you go to fart at someone, or maybe for some reason you decide to keep it to yourself and waste the fart and not direct it at one of your friends, you go to fart and accidently spray shit in your pants.

After shitting the main part, you spray like crazy in the can.

Bend over to fart at someone, push hard and let it go, and accidently shit yourself, then you scream "AWW NO, AFTERSPRAY"